The Murray loop test is a method of using a Wheatstone bridge to find the location of a fault in underground wiring without having to dig first. One way to make the test is to use the setup shown.

[Keri] selects them not with his golden ears, but by wiring both pots together as a Wheatstone bridge. A meter between the two wipers would detect any current due to a mismatch. A Wheatstone ...